Proposal of a comprehensive landslide management methodology considering various exposure assessments

Case study of future risk estimation in Yokosuka City and Hiroshima City

Abstract

Sediment disasters have been dealt with mainly through the construction of erosion control facilities. In recent years, comprehensive approaches that include non-structural measures such as the development of evacuation systems and residential guidance have been attracting attention. However, the actual operation of these measures is still significantly biased toward the construction of erosion control facilities. In this study, the authors examined a method for identifying sediment disaster risk based on multiple indicators and evaluating multiple countermeasures in a cross-sectional manner, paying special attention to collapses of steep slopes. A method to study the combination of more effective countermeasures for each region within a limited budget is proposed.